| Active Delivery's Ltd | Transport & logistics | 2025 |
| Active Holistic Health Limited | Health & social care | 2019 |
| Active Minds Bradford C.I.C. | Health & social care | 2024 |
| Active Support Group CIC | Administrative & support | 2023 |
| Active Surveillance System Ltd | Administrative & support | 2023 |
| Active Trendz Ltd | Wholesale & retail | 2022 |
| Activpro Ltd | Professional & scientific | 2017 |
| ACTU8 Ltd | Wholesale & retail | 2024 |
| Acuity Optical Ltd | Health & social care | 2023 |
| Acume Forensics Limited | Professional & scientific | 2004 |
| Acute Financials Limited | Professional & scientific | 2012 |
| Acuveritas Accountancy Ltd | Professional & scientific | 2024 |
| ACW Garden Centre LLP | | 2008 |
| AD & J Smith Properties Limited | Real estate | 2017 |
| AD Astra BF Limited | Hospitality | 2023 |
| AD Builders and Developers Limited | Construction | 2018 |
| AD Business Solutionz Limited | Professional & scientific | 2014 |
| AD Fabs (Engineering) Ltd | Manufacturing | 2015 |
| AD Fabs Ltd | Construction | 2021 |
| AD Facilities Ltd | Transport & logistics | 2024 |
| AD Local Store Limited | Wholesale & retail | 2025 |
| AD Maintenance Yorkshire Limited | Administrative & support | 2025 |
| AD MOT Centre Ltd | Wholesale & retail | 2026 |
| AD Property Group Limited | Real estate | 2017 |
| Ad&H Transport Limited | Transport & logistics | 2016 |
| ADA Gray Consulting Limited | Professional & scientific | 2024 |
| ADA Rentals Ltd | Real estate | 2022 |
| Adair Services Ltd | Transport & logistics | 2025 |
| Adam & Co Accountancy Limited | Professional & scientific | 2000 |
| Adam & Co Consulting Limited Liability Partnership | | 2001 |
| Adam & Co Financial Management LLP | | 2002 |
| Adam Business Support Services Limited | Administrative & support | 2013 |
| Adam FC Steak House Ltd | Hospitality | 2024 |
| Adam Garage Limited | Wholesale & retail | 2023 |
| Adam Halal Meat & Poultry Ltd | Wholesale & retail | 2023 |
| Adam Howard GAS and Plumbing Limited | Construction | 2013 |
| Adam Hussain Limited | Administrative & support | 2019 |
| Adam K Ltd | Real estate | 2009 |
| Adam Management Ltd | Real estate | 2011 |
| Adam SON & Co. Ltd | Extraterritorial | 2020 |
| Adam Transport Ltd | Transport & logistics | 2025 |
| Adam Travel Group Ltd | Transport & logistics | 2026 |
| Adam's Connections Ltd | Wholesale & retail | 2026 |
| Adam'Z Tyre'Z Ltd | Professional & scientific | 2025 |
| Adammotorgroup Ltd | Wholesale & retail | 2026 |
| Adamotive Limited | Professional & scientific | 2013 |
| Adams & Duxbury Joiners & Contractors Limited | Construction | 2002 |
| Adams Cafe Bradford Ltd | Hospitality | 2026 |
| Adams Car Clinic Ltd | Wholesale & retail | 2021 |
| Adams Family Holding Limited | Financial services | 2024 |
| Adams Local Store Ltd | Wholesale & retail | 2024 |
| Adams Logic (UK) Ltd | Information & communication | 2022 |
| Adams Tyres Bradford Limited | Wholesale & retail | 2021 |
| Adamson & Sons Limited | Administrative & support | 2016 |
| Adamsons Garages Limited | Wholesale & retail | 2013 |
| Adamsons Group Ltd | Financial services | 2020 |
| Adamsons Limited | Wholesale & retail | 2019 |
| Adamsons Retail (Manchester) Limited | Wholesale & retail | 2007 |
| Adamsventureshq Limited | Transport & logistics | 2026 |
| Adam’S Building Construction Limited | Construction | 2021 |
| Adam’S Delivery Service Ltd | Transport & logistics | 2025 |
| Adaptive Control Solutions Limited | Information & communication | 1999 |
| Adbr Training and Consulting Ltd | Education | 2025 |
| Addah Limited | Wholesale & retail | 2024 |
| Addar Limited | Wholesale & retail | 2023 |
| Addison Haulage Ltd | Transport & logistics | 2019 |
| ADE Scaffolding Ltd | Construction | 2026 |
| Adeb Height Limited | Wholesale & retail | 2025 |
| Adeel Saleem Delivery Limited | Transport & logistics | 2026 |
| Adeel Spice Pizza Bar Ltd | Hospitality | 2023 |
| Adelmar Limited | Financial services | 2017 |
| Adeno Group Ltd | Wholesale & retail | 2025 |
| Adenopl Limited | Wholesale & retail | 2025 |
| Adeolushina Limited | Health & social care | 2016 |
| Adfabs Automated Gates Limited | Administrative & support | 2019 |
| Adfire Inns Limited | Hospitality | 2024 |
| ADG Accountants (Tax) Limited | Professional & scientific | 2015 |
| ADG Care Ltd | Real estate | 2019 |
| Adhd Clinical UK Ltd | Health & social care | 2025 |
| Adhesive Innovation Group Ltd | Financial services | 2021 |
| Adhoc Security Services Ltd | Administrative & support | 2021 |
| Adi's Pretz Ltd | Wholesale & retail | 2024 |
| Adil Pharma Limited | Health & social care | 2022 |
| Adil Rashid Cricket Academy Ltd | Arts & recreation | 2012 |
| Adil Transport Ltd | Transport & logistics | 2022 |
| Adis Developments Ltd | Construction | 2020 |
| Adisales Limited | Wholesale & retail | 2024 |
| ADJ Bodycare Centre Limited | Wholesale & retail | 2020 |
| Adjam Property Management Limited | Real estate | 2021 |
| Adkcustom Ltd | Wholesale & retail | 2025 |
| Adler Jones Ltd | Real estate | 2018 |
| ADLOG2GO Ltd | Transport & logistics | 2025 |
| Adluceo Consulting Ltd | Information & communication | 2014 |
| ADM Civils Ltd | Construction | 2026 |
| ADM Media Ltd | Information & communication | 2023 |
| Admitc Limited | Information & communication | 2023 |
| Admo Electrical Ltd | Construction | 2025 |
| ADN Asset Management Ltd | Real estate | 2018 |
| Adnan Locums Limited | Health & social care | 2017 |
| Adnan@Travel Limited | Transport & logistics | 2025 |